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Former Discovery Chevrolet <br /> "f\j March 28, 1995 <br /> TPHg and benzene were detected in wells MW-1 (3,900 and 730 ppb, respectively) and <br /> MW-2 (1,000 and 180 ppm, respectively). TPHg, BTEX, and O&G were not detected in <br /> Well MW-3. TPHd was detected in Well MW-3 at 200 ppb. These data have been used <br /> to construct a TPHg/Benzene/TPHd Concentration Map (Figure 4). <br /> DISCUSSION AND CONCLUSIONS <br /> During the first quarter 1995 groundwater beneath the subject site appears to have risen . <br /> approximately 0.05 to 0.08 feet from water levels measured during the third quarter 1994. <br /> Water appears to flow toward the north-northwest under a gradient of 0.003. Although these <br /> data appear generally consistent with monitoring data from third quarter 1994, the recent <br /> heavy rains may have affected the observed flow direction. <br /> TPHg and benzene were detected upgradient (well MW-1) and downgradient (well MW-2) <br /> .of the former gasoline USTs.. Low concentrations of TPHd were detected downgradient <br /> (well MW-3) of the former waste oil UST. O&G has not been detected in groundwater <br /> samples from well MW-3 for two consecutive sampling events. <br /> Additional soil samples and groundwater monitoring wells are necessary to further assess site <br /> conditions. GSI recommends that the existing groundwater monitoring wells be monitored <br /> and sampled for one more quarter to further assess fluctuations in groundwater depth and <br /> flow direction and hydrocarbon concentrations. These data will be used to better place <br /> additional groundwater monitoring wells in the vicinity of the former USTs. After <br /> evaluation of the second quarter 1995 monitoring data, a work plan for additional site <br /> assessment will be prepared. <br /> NEXT QUARTER'S PLANNED ACTIVITIES <br /> Activities planned for the second quarter 1995 at the subject site include: <br /> E <br /> • Monitor, purge, and sample wells MW71 through MW-3. Groundwater samples from <br /> wells MW-1 and MW-2 will be analyzed for TPHg and BTEX. The groundwater sample <br /> from well MW-3 will be analyzed for TPHg, TPHd, BTEX, and O&G. <br /> • Dispose of the soil cuttings generated during the installation of wells MW-1 through <br /> MW-3, and the purge water generated during the development and sampling of the i <br /> monitoring wells. t <br /> f <br /> 0 Prepare a Quarterly, Groundwater Monitoring and Site Summary Report. <br /> f <br /> f <br /> - 1 f <br /> 8146.02-1 4 k <br /> i <br />